Psammophis trinasalis is now Psammophis leightoni

Leighton's Sand Snake (Psammophis leightoni). Three species of sand snake - the Cape Sand Snake (Psammophis leightoni), the Namib Sand Snake (Psammophis namibensis) and the Fork-marked Sand Snake (Psammophis trinasalis) were recently synonymized and are now treated as a single species.

Paper reference here: https://onlinelibrary.wiley.com/doi/abs/10.1111/zsc.12514

I agree this is a incorrect taxon swap.

Apologies and thanks for catching that. I reverted Psammophis trinasalis -> Psammophis afroccidentalis, changed it to Psammophis trinasalis -> Psammophis leightoni (see above) and committed. Thanks all!